EB

Format

Parameters

inlo

lowest input brightness value (default=0)

inhi

highest input brightness value (default=255)

outlo

new low brightness value (default=0)

outhi

new high brightness value (default=255)

Remarks

The input brightness values correspond to the brightness values on the image frame. Input brightness values below inlo and above inhi are not changed. Inlo is output at value outlo and inhi at value outhi. Brightness values between inlo and inhi are output at values determined by linear interpolation from outlo and outhi.

When using the mouse-controlled version, moving the cursor to the right along the x-axis decreases the upper brightness bound (from level 255) to be enhanced as white (255). Moving the cursor upward along the y-axis increases the lower brightness bound (from level 0) to be enhanced as black (0).

Occasionally, a brightness range will contain a value that will not need to change as the new values are assigned by EB. In the example below, the data's brightness value of 104 happens to match the value assigned during the EB stretch. Since value 104 did not need to change, it becomes a breakpoint in the EU TABLE listing and is not shown on the output below. Command EB
62 164 2 250 produces output from EU TABLE like this: